Spanky, I am sure you have read all the well meaning welcome messages and good-on-'em, but would still like an answer to your initial question.
The best reference I have found for Mercedes colour codes is at;
http://meinbenz.de/and click on the link in the left column;
Farbtabellenthen select your model, in this case R/C 107
The colours are listed according to the three figure code on your chassis plate, and where underlined you can click there for a photo of said car in said colour.
You may need to scroll down to the Metallic list.
It is in German, but in most case not hard to decipher the English name for the colour.
By the way, if there is a letter after the numbers on your chassis plate, that only refers to the paint manufacturer - ie G = Glasurit.
That car, and that year, my guess is code 930 which is SilberBlau. Whatever, any reputable bodyshop should be able to get a good match from the code.
Have fun,
Chris M.
